Definition of "navigation light" []

• Light on an airplane that indicates the plane's position and orientation; red light on the left (port) wing tip and green light on the right (starboard) wing tip (noun)

WordNet. Princeton University. 2010.

• "The previous night, Captain Heinrich von Hennig, commanding U-18, was passing eastward off the Orkneys when he saw that the Pentland Skerries navigation light was lit and decided to make the attempt."